FKIE_CVE-2021-47384

Vulnerability from fkie_nvd - Published: 2024-05-21 15:15 - Updated: 2025-04-02 14:52
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Summary
In the Linux kernel, the following vulnerability has been resolved: hwmon: (w83793) Fix NULL pointer dereference by removing unnecessary structure field If driver read tmp value sufficient for (tmp & 0x08) && (!(tmp & 0x80)) && ((tmp & 0x7) == ((tmp >> 4) & 0x7)) from device then Null pointer dereference occurs. (It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers) Also lm75[] does not serve a purpose anymore after switching to devm_i2c_new_dummy_device() in w83791d_detect_subclients(). The patch fixes possible NULL pointer dereference by removing lm75[]. Found by Linux Driver Verification project (linuxtesting.org). [groeck: Dropped unnecessary continuation lines, fixed multi-line alignments]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6cb01fe630eaffc5a2c3f7364436caddba286623Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/746011193f44f97f8784edcf8327c587946745fcPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7c4fd5de39f273626a2b0f3a446d2cc85cd47616Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dd4d747ef05addab887dc8ff0d6ab9860bbcd783Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6cb01fe630eaffc5a2c3f7364436caddba286623Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/746011193f44f97f8784edcf8327c587946745fcPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7c4fd5de39f273626a2b0f3a446d2cc85cd47616Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/dd4d747ef05addab887dc8ff0d6ab9860bbcd783Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (w83793) Fix NULL pointer dereference by removing unnecessary structure field\n\nIf driver read tmp value sufficient for\n(tmp \u0026 0x08) \u0026\u0026 (!(tmp \u0026 0x80)) \u0026\u0026 ((tmp \u0026 0x7) == ((tmp \u003e\u003e 4) \u0026 0x7))\nfrom device then Null pointer dereference occurs.\n(It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers)\nAlso lm75[] does not serve a purpose anymore after switching to\ndevm_i2c_new_dummy_device() in w83791d_detect_subclients().\n\nThe patch fixes possible NULL pointer dereference by removing lm75[].\n\nFound by Linux Driver Verification project (linuxtesting.org).\n\n[groeck: Dropped unnecessary continuation lines, fixed multi-line alignments]"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: hwmon: (w83793) Corrija la desreferencia del puntero NULL eliminando el campo de estructura innecesario. Si el controlador lee el valor tmp suficiente para (tmp \u0026amp; 0x08) \u0026amp;\u0026amp; (!(tmp \u0026amp; 0x80)) \u0026amp;\u0026amp; (( tmp \u0026amp; 0x7) == ((tmp \u0026gt;\u0026gt; 4) \u0026amp; 0x7)) desde el dispositivo, luego se produce la desreferencia del puntero null. (Es posible si tmp = 0b0xyz1xyz, donde los mismos literales significan los mismos n\u00fameros) Adem\u00e1s, lm75[] ya no sirve para nada despu\u00e9s de cambiar a devm_i2c_new_dummy_device() en w83791d_detect_subclients(). El parche corrige la posible desreferencia del puntero NULL eliminando lm75[]. Encontrado por el proyecto de verificaci\u00f3n de controladores de Linux (linuxtesting.org). [groeck: Se eliminaron l\u00edneas de continuaci\u00f3n innecesarias, se corrigieron alineaciones de varias l\u00edneas]"
    }
  ],
  "id": "CVE-2021-47384",
  "lastModified": "2025-04-02T14:52:28.823",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
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  "published": "2024-05-21T15:15:23.947",
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  "vulnStatus": "Analyzed",
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          "lang": "en",
          "value": "CWE-476"
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      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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